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Characterization and Evaluation of the At-Sea Performance of the Airborne Expendable Kd and Temperature Probe
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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This report documents the performance of the Airborne Expendable Vertical Attenuation Kd and Temperature AXKT Probe manufactured by Sippican Incorporated during three at-sea evaluation tests. The tests include clear and overcast sky conditions with relatively calm seas for all tests. The test locations include a Norwegian fjord and nearshore and offshore sites in the Northwest Pacific Ocean. The performance of the AXKT is evaluated relative to shipboard measurements of the vertical attenuation coefficient, Kd, from 15 to 100 m. Despite several potential design weaknesses that can be corrected, the AXKT showed that it has potential to measure Kd to 200 m in waters with Kd values less than 0.06 m-1. This is a detection range of 12 product of Kd and maximum depth of valid signal. In comparison with shipboard measurements, the AXKT 1 exceeded the depth capabilities of shipboard measurement systems 2 was generally within 10 of the shipboard-derived Kd when multiple probes were used, with departures of 20 to 40 for a single probe in regions of high optical or temperature variability and 3 exhibited trends for unresolved systematic departure of Kd relative to those obtained with shipboard systems. AXKT, Shipboard measurement system.
APPROVED FOR PUBLIC RELEASE